---
id: CVE-2026-119420
title: Lago through 1.55.0 Authentication Bypass via acceptInvite GraphQL Mutation
summary: >-
  Lago through 1.55.0 contains an authentication bypass vulnerability that
  allows organization administrators to obtain session tokens for existing
  accounts via the acceptInvite mutation without a password check. Attackers can
  invite a vic…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-288
vendor: getlago
product: lago
affected:
  - lago <= 1.55.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-05T21:14:22.634773Z'
exploitAvailable: true
published: '2026-10-30'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:14:44.889Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-119420'
references:
  - url: >-
      https://github.com/getlago/lago-api/commit/5a9d5935b027d1db7171c7c015283d5870451305
  - url: 'https://github.com/getlago/lago-api/pull/6146'
  - url: >-
      https://github.com/getlago/lago-api/blob/v1.55.0/app/services/users_service.rb#L89-L98
  - url: >-
      https://github.com/getlago/lago-api/blob/v1.55.0/app/services/invites/accept_service.rb#L15-L16
  - url: 'https://abraxaslabs.tech/research/lago-invite-ato'
  - url: 'https://github.com/getlago/lago-api'
  - url: >-
      https://www.vulncheck.com/advisories/lago-through-1.55.0-authentication-bypass-via-acceptinvite-graphql-mutation
    label: >-
      VulnCheck Advisory: Lago through 1.55.0 Authentication Bypass via
      acceptInvite GraphQL Mutation
tags:
  - cve.org
  - exploit-available
epss: 0.00394
epssPercentile: 0.33779
ingestedAt: '2026-11-03T10:42:03.639Z'
---

## Overview

Lago through 1.55.0 contains an authentication bypass vulnerability that allows organization administrators to obtain session tokens for existing accounts via the acceptInvite mutation without a password check. Attackers can invite a victim's email, accept with an arbitrary password, and receive a JWT to access the victim's organizations, billing data, API keys and payment integrations.

## Affected

- `lago <= 1.55.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.